期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 116, 期 25, 页码 12153-12155出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1906000116
关键词
manganese reduction; sulfide oxidation; Sulfurimonas
资金
- International Bureau of the Bundesministerium fur Bildung und Forschung [01DK12043]
- Deutsche Forschungsgemeinschaft Grant ANAMARE [SCHU1416/5-1]
Mn is one of the most abundant redox-sensitive metals on earth. Some microorganisms are known to use Mn(IV) oxide (MnO2) as electron acceptor for the oxidation of organic compounds or hydrogen (H-2), but so far the use of sulfide (H2S) has been suggested but not proven. Here we report on a bacterial isolate which grows autotrophically and couples the reduction of MnO2 to the oxidation of H2S or thiosulfate (S2O32-) for energy generation. The isolate, originating from the Black Sea, is a species within the genus Sulfurimonas, which typically occurs with high cell numbers in the vicinity of sulfidic environments [Y. Han, M. Perner, Front. Microbiol. 6, 989 (2015)]. H2S and S2O32- are oxidized completely to sulfate (SO42-) without the accumulation of intermediates. In the culture, Mn(IV) reduction proceeds via Mn(III) and finally precipitation of Ca-rich Mn(II) carbonate [Mn(Ca)CO3]. In contrast to Mn-reducing bacteria, which use organic electron donors or H-2, Fe oxides are not observed to support growth, which may either indicate an incomplete gene set or a different pathway for extracellular electron transfer.
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